I just finished a bit of an epic inventing session and thought someone might find it useful.
It's all made from about $15 in off the shelf 90mm pvc fittings.
It tilts to swap flow direction each time a timer switches the pump off then on again, or if you adjust the flow rate with a little more accuracy, you can make it switch every 20 minutes or whatever on constant flow.
The full build d…
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